Field migration rates of tidal meanders recapitulate fluvial morphodynamics.

Published

Journal Article

The majority of tidal channels display marked meandering features. Despite their importance in oil-reservoir formation and tidal landscape morphology, questions remain on whether tidal-meander dynamics could be understood in terms of fluvial processes and theory. Key differences suggest otherwise, like the periodic reversal of landscape-forming tidal flows and the widely accepted empirical notion that tidal meanders are stable landscape features, in stark contrast with their migrating fluvial counterparts. On the contrary, here we show that, once properly normalized, observed migration rates of tidal and fluvial meanders are remarkably similar. Key to normalization is the role of tidal channel width that responds to the strong spatial gradients of landscape-forming flow rates and tidal prisms. We find that migration dynamics of tidal meanders agree with nonlinear theories for river meander evolution. Our results challenge the conventional view of tidal channels as stable landscape features and suggest that meandering tidal channels recapitulate many fluvial counterparts owing to large gradients of tidal prisms across meander wavelengths.

Full Text

Duke Authors

Cited Authors

  • Finotello, A; Lanzoni, S; Ghinassi, M; Marani, M; Rinaldo, A; D'Alpaos, A

Published Date

  • February 2018

Published In

Volume / Issue

  • 115 / 7

Start / End Page

  • 1463 - 1468

PubMed ID

  • 29378949

Pubmed Central ID

  • 29378949

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1711330115

Language

  • eng